Pump and motor



July 31, 1928.

' M. A. SEAHOLM PUMP AND MOTOR Original Filed Dec. 9, 1925 2 Sheets-Sheet 2 Patented July 31, 1928.

UNITED; STATES PATENT OFFICE.

MARTIN AUGUST .SEAHOLM, or oHIoAGqILLINoIs.

PUMP AND MOTOR.

Application filed December 9, 1925, Serial No. 74,264. Renewed December 27,1927.

My invention relates to a machine having a rotary element which when positively driven will cause the machine to function as a pump, or blower, or as a. compressor, or which, when proper connections are'made to a source of liquid pressure, either liquid or gaseous, will'be rotated and cause the machine to funct-ion as a motor, and whether the machine is functioning as a pumping engine, or a motor, is capable of being rotated in either direction. The object of my invention is the provision ofa simple machine of the character stated, capable of a wide variety of uses and having novel fea tures of construction and mode of operation which are desirable and useful, and which adapt the machine'to'accomplish the various purposes for which it was designed. My invention is capable of being employed in a variety of forms and in the drawings I have illustrated a preferred form of my invention and also amodified form, it being understood that the particular forms of construction shown are'described by way of exemplification and without intention of limiting my invention thereto, except so far as the specific construction on which the claims are founded may be essential to accomplishing the ends in view. My invention resides in the new combination and arrangementof parts and members, or equivalent parts, -op-' erating as described, the essential elements thereof being pointed out in the appended claims. v

In the drawings Figure l is a top plan view of the preferred form of my invention; Fig. 2 is a central vertical section of the same, taken longitudinally of the rotor and driving shaft, such rotor and shaft being shown in elevation Fig. 3 is an end view of the same, viewed from the left of the machine as seen. in Fig. 2 and with the removal cover plate of the casing at the left removed; Fig. 4: is a vertical cross-section on the line H of Fig. 2,- viewed in the direction indicated by the arrow 5 is a top plan view of a modified form of my invention; Fig. 6 is a. central vertical section of such modified form, corre-' sponding to Fig.2; Fig. 7 is an. end view of such modified form, corresponding to 3 excepting that the rotor is shown in section in a plane a short distance inside of the joint between the body of the casing and the cover plate; and Fig. 8 is a view of the rotor of said modified form, detached.

The same reference characters indicate the same parts in all the figures of the drawsive, the moving parts of the machine are supported in a casing comprising a body member 1, and a cover plate 2 bolted thereto, The body member is chambered to receive the rotor 3, and also chambered to form a shorter cylindrical chamber of larger diameter than the rotor chamber and eccentric to such rotor chamber, the chamber of larger diameter being arranged to receive a driving ring 4. Thearrangement is such that the outer face of the rotor and inner face of the driving ring touch each other and make sealed sliding contact. The driv- 1H0 ring is provided adjacent its left outer side with a peripheral row ofgear teeth 5 arranged to mesh with the teeth of a pinion 6 secured to the shaft 7, which latter may be which power may be imparted.

The cover plate 2 is formed with anrecess arranged to provide a bearing for the left end of the rotor, and serves also to enclose a working chamber between the rotor and ring exhibiting in radial section the form of a lune or crescent having its horns meeting at the point-of contact between the rotor and ring.

That end of the rotor which extends across or through the working chamber is formed with a diametric-al wall 9 in which is formed a slideway arranged to slidingly receive a slide 10 pivoted at one end to the ring 4. This'slide is of such width as to make a smooth working fit with the crescent-shaped side walls of the casing members between the cylindrical faces of the ring and rotor, and divides the working chamber into separate spaces. The outer wall of the rotor is formed with two ports, marked 12 and 13, respectively, one on each side of the slide and both close to the slide adjacent its pivoted end, so that the two cylinder spaces are in communication respectively with spaces inside the rotor on opposite sides of the wall 9. This wall extends inwardly (to the right, as viewed in Fig. 2) to a point about half way between the working chamher and the inner end of the rotor chamber,

where it merges into a semi-circular cross partition 9*, the connected walls thus dividing the interior ofthe rotor into two separate chambers, marked respectively A and B. The chamber A, into which the port 12 opens, communicates through ports lt with an annular passage C formed in the machine casing, while the chamber B, into which the port 13 opens, communicates through 'ports15 with a similar annular passage D in the casing. In the present instance the passages C and D each communicate with two aligned, internally threaded flow connections, (marked CC and D--D, respectively) one orthe other of which can be plugged, if desired, and the other connected according to requirements of the particular use to which the machine is to be put.

Assuming that the machine is employed. as a water pump it will be clear that when the shaft 7 is rotated to drive the pinion 6 in the direction indicated by the arrow in Fig. 3 of the drawing, the ring 4 will be rotated as indicated and through the slide 10 will rotate the rotor 3, the ring and rotor traveling in the same direction but their concharge connection D of the machine, while it will alsoact todraw water from the in let connection 0 throughthe annular manifold C, ports 14-, rotor chamber A and port 12 into the space- F back of the slide. The space F thus increases in size until it occupies the entire working chamber at the instant when the pivoted end of the slide crosses the line of contact between the rotor and ring, and the water thus drawn in is in turn forced out during thenext revolution of the rotor. It is obvious that the machine may be operated to pump a gaseous fluid and serve as a. blower, or when connectedto a suitable reservoir toserve as a compressor.

It is further obvious that if the power shalt be rotated in the opposite direction, it will operate in exactly the same manner, but with the direction of flow of the fluid reversed.

When employed as a motor, it will be readily understood that when a fluid under pressure (whether gaseous or liquid) is admit-ted through the connection C and communicating passages and ports it will act in the space F of the working chamber upon the slide 10 to rotate the rotor and connected power shaft in-the same direction as that hereinbefore particularly described, the fluid in the space E in front of the slide esca'i'i' ing through the port 13 and connected passages leading to the exhaust connection D. In this case, also, the direction of rotation of the machine may be reversed, by reversal of the inlet and exhaust connections.

Describing now the modified form of my invention illustrated in Figs. 5'to 8, inclu sive, the body member 20 of the casing is chambered to receive the rotor 21 and ring 22, which are eccentrically arranged in the same manner as the corresponding member in the preferred form of my invention already described. The cover member 20 of the casing is recessed to form an annular bearing 23 for the outer end ofthe rot-or and is also formed with a chamber M inside the in the cover plate. ,At the inner end of the rotor the casing body is formed with a cha-mber N which communicates with a flow connection N.

The rotor is formed with a diametrical partition wall 24in which is formed a slideway which slidingly receives a slide 25'pivoted at one end to the ring 22} The end-of the rotor adjacent the chamber M is open on one side of the wall 24 to such chamber and on the other side of such wall the opposite end of the rotoris cut away to open into the chamber N, and the circumferential wall of the motor is formed with two ports marked 26 and 26" adjacent and on opposite sidesot the slide 25. v

The rotor of this modified form of my invention is directly connected to the power shaft 27 of the machine and may, as illustrated, be formed integral with it. Preferably the outer end of. the shaft is provided with a suitable adjustable thrust bearing .28 to take up the stress of the liquid pressure upon the rotor, which, in this form of my invention is unbalanced and exerts an endwise pressure on the rotor member.

It will readily be understood from the foregoing description that when power is applied to drive the rotor in the direction indicated by the arrow in Fig. 7 the liquid in the space ahead of the slide (marked 0) Hil will be forced out through the port26 and chamber N to the discharge connection N,

while liquid will be drawn through the inlet connection M chamber M and port 26 into the space (marked P) behind the slide, to be in turn forced out by the slide after its pivoted end has crossed the line of contact between the rotor and ring.

It will further be understood without detailed explanation that the machine is capable of functioning either as a pump, or motor, and that it is reversible in direction of rotation in either case, though if such reversal ofdirect-ion of rotation is contemplated, it will be desirable to make provision "applied to' the ring and transmitted through F the slide to the rotor.

for taking up'eiid thrust ofthe rotor i n both plied'directly to the rotor andtransinitted to the ring through the slide, instead of being When functioning a'sa motor the power in both cases acts upon "the slide and in the preferred form of my "invention is applied through the ring, while in the modifiedform it is applied-{through the rotor. p It will be noted that in both forms of my invention the ring and rotor are positively connected through the pivoting of the slides to the ring, whereby it results that the power'shaft may be'connected to eitherone of: the inter-connected rotatable members, and also that the ring provides a circular 'innerface for the working chamber which "travels in the same direction and at the same angular velocity as the rotor, thus reducing to a m nimum the slippage and wear betwe'enthe two. Moreover, the provision of a rotating ring seatedin the casing for "the slide to work in, obviates the tendency to' 'wear the circular face of the wvorking chamber out of round, as isthe case in the class of pumps in which a vane in sliding contact with a circular face formed in the casing member itself is employed. Furthermore, the outer casing is hermetically sealed, and as a smooth closev fit may easily be made between the ring and its seat in the casing, and the ring has no tendency to wear out of true circular shape, leakage of fluid is practically overcome. x

I claim: I,

1. In a fluid pressure engine, a stationary casing having a cylindrical ring seat, a cy-' lindrical ring mounted to rotate ins'aid seat,

a cylindrical rotor of lesser diameter than .the inner diameter of said ring rotatably sages on opposite sides of said slide slide opening into such passages, and said mounted in said casing eccentrically of said ',i 'ing' and cont-acting its inner face, a slide ring and slidingly mounted diametrically thereof, said flow paspivoted to said in said rotor rotor being formed with separated on opposite sides of the pivoted end of the casing being provided with separate inlet fand'outletconnections in constant communication respectively with the separate flow passages in 'said rotor, journaled in the casing and having geared connection with said ring.

2, lna fluid pressure engine, a stationary casing, a ring rotat-ably mounted in said .casing and having an internal cylindrical face,

a rotor formed with a slideway and having a cylindrical face of lesser diameter than the and ports and a power shaft internal'face of the I ring also rotatably mounted in said casing eccentrically of said ring and contactingits internal face, a slide in said slidewayconnected to :said ring, said casing being formed to provide parallel curved side walls between said rotor and ring and enclose a working chamber and said slide being arranged to divide said working chamber into inlet and outlet spaces, and said casing being provided with inlet and outlet' the inner diameter of said ring rotatably mounted in said casing eccentrically of said ring and contacting its inner face, a slide pivoted to ,said ring andslidingly mounted in-said rotor diametrically thereof, saidrotor being formed withseparated flow passages on opposite sides of said-slide and ports on opposite sides of the pivoted end of the slide opening into such passagesand said casing being formed with circumferential inlet and outlet passages around said rotor and the separated flow passages of said rotor being formed with ports opening respectively into said inlet and outlet passages, and a power shaft journaled in the casing and having geared connections with saidring;

4. In a fluid pressure engine, a stationary casing having a cylindrical ring seat, a cylindrical ring mounted to rotate in said seat, a hollow cylindrical rotor of lesser diameter than said ring rotatably mounted in said casing eccentrically of said ring and contacting its inner face, i said rotor being formed with a diametrical partition separating two flow passages and said partition being formed with aslideway, slide in said slideway pivoted to said ring and dividii g a working chamber enclosed by said ring and rotor and casing walls into two spaces, ports on opposite sides of the pivoted end of said slide connecting said flow passages of the rotor respectively with said chamber spaces, said casing being provided with inlet and outlet'connections in constant communication with said flow passages, and

apower shaft journaled in said casing and having geared connections wit-h saidring.

5. A fluid pressure engine according to claim 4 in which said rotor is closed at its ends and atone end extends beyond the wvorking chamber and the diametrical partition extends into such end and terminates in a semrcircular cross partition, and in which said casing is formed with annular inlet and outlet passages surrounding said rotor on opposite sides of said cross-partition r a cylindrical inner face and parallel side faces, a cylindrical ring seated in said chamvber, a cylindrical rotor of lesser diameter than the inner diameter of saidsring arranged wlthin said rlng and contacting its .inner face, the ends of said rotor extending beyond the ends of the ring and being journaled in recesses in the casing extending oppositelyfromsaid side faces of the ring chamber, a slide of the same width as the ring and pivoted thereto slidingly mounted in said rotor diametricallythereof, said slide being arranged to slidingly-contact the side faces of the. ring chamber, and said rotor being formed with separated flow passages on opposite sides of said slide and ports on opposite sides of the pivoted end of the blade opening into such passages, and said casing being provided with separate inlet and outlet connections in constant communication respectively with the separate flow passages in said rotor, and Ya power shaft journaled in said casing and on the inside thereof operatively-connected with one. of the interconnected rotatable members.

- 7. A fluid pressure engine according to claim 6 in which said slide is a rectangular block arranged to extend at least half way through the rotor in all positions.

8. In a fluid pressure engine, a stationary closed casing having separate inlet and outlet connections and formed with a cylindrical ring seat, a cylindrical ring mounted to rotate in said seat, a cylindrical rotor of lesser diameter than the inner diameter of said ring rotatably mounted in said casing eccentrically of said ring and contacting its inner face, a'slide pivoted to said ring and slidingly mounted in said rotor diametrically thereof, said rotor being formed with separated fiow passages on opposite sides of said slide and ports on opposite sides of the pivoted end of the slide communicating severally with said inlet and outlet connections, and a power shaft journaled in the casing wall, and on the inside of the casing oper- 10. A fluid pressure engine according to claim Sin Which said casing includes a casing body structure and a removable cover memher and in which the body structure is arranged torotatably receive the ring and one terior of said inner cylinder, and. drivin end of the rotor and the cover member is arranged to rotatably receive the other endof the rotor and abut againstone side face of the ring. I V

11. In afluid pressure engine,.a stationary closed casing internally chambered to provide a cylindrical ring seathavingextended parallel side faces, a cylindrical ring seated in said chamber, a cylindrical rotor planes of the side faces of the ring and being journaled in rotor seats-extending oppositely from said extended side faces of the ring chamber, aslide of the same width as the ring and pivoted thereto slidingly' mounted in a slot in the rotor extendinglongitudinally thereof, said slide being arranged; to slidingly contact the side extended faces of the ring seat anddivide-the chamber enclosed by the ring and rotor and extended side faces of the ring seat int-o inlet and outlet spaces, and said 'casingbeing ,provided with inlet and outlet passages communicating respectively with said inlet and outlet spaces of said chamber, anda'power shaft journaled in said casing and on the inside thereof operatively connected with one ofthe interconnected rotatable members. 12. In a device of the characterset forth, a'stationary closed casing having an internal cylindrical bearing seat and having also a removable cover plate, an inner cylinder in said seat having an. open end providing an annular wall having an edge disposed ad'- jacent said cover plate, a rotor journalled eccentrically in said casing and contacting with the internal surface of said inner cylinder and provided with a slideway, a slide working in said slideway and having one end pivotally connected with said inner cylinder, inlet and outlet ports leading through the casing and communicating with the inmeans operatively connected with one of the interconnected rotatable members mentioned. 13. In a device of the character described,

a stationary closed cylindrical casing provided with an internal cylindrical bearing seat andequipped with a removable cover plate, an open-ended cylinder revolubly fitted within said bearing seat and having its annular edge adjacent said cover plate arranged in contact with said cover plate, a rotor journalled eccentrically in said casing and contacting with the internal surface of said cylinder and provided with a slideway, a slide worlnng in sa d. sl deway and having one end-pivotally connected with said cylinder, inlet and outlet ports leading through the casing and communicating with the interior of said cylinder, and a shaft journalled in said casing and on the inside thereof operatively connected with one of the interconnected rotatable members mentioned.

14. In a fluid pressure engine, a stationary closed casing including a body member and a removable cover plate member, one of said members being formed with an internal cylindrical bearing seat, an inner rotatable member in said seat having cylindrical inner and outer faces and having an open end providing an annular wall having its edge disposed in the plane of the joint between said body member and said cover plate member, a rotor ournalled eccentrically in the casing and contacting the inner face of said inner rotatable member and provided with a slide-- way, a slide working in said slideway and having one end pivotally connected with said inner rotatable member, inlet and outlet ports leading through the casing and communicating with the interior of said inner rotatable member and a power shaft journalled in the casing wall and on the inside of the casing operatively connected with one of the interconnected rotatable members mentioned.

15. In a fluid pressure engine, a stationary closed casing provided With inlet and outlet flow passages and formed with 'an internal cylindrical bearing seat,'a rotatable member in said seat having a cylindrical inner face, a rotor of lesser diameter than said rotatable member arranged eccentrically within it and contacting its inner face, the space in said casing between said rotor androtatable member forming a working chamber, a slide mounted in said rotor and pivotally connected to said rotatable member arranged to traverse said working chamber, said inlet and outlet passages communicating severally with said working chamber on opposite sides of said slide, and a power shaft jou'rnalled in said casing and on the inside thereof operatively connected to one of the interconnected rotatable members mentioned.

In testimony whereof, I have subscribed my name MARTIN AUGUST SEAHOLM. 

